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Structural Elucidation of the Binary Mixtures of [EMIM][BF 4 ] and [BMIM][BF 4 ] in Ethyl‐Substituted Solvents by Isothermal Titration Calorimeter
Author(s) -
Jain Preeti,
Kumar Anil
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800976
Subject(s) - ionic liquid , chemistry , enthalpy , solvent , solvation , ionic bonding , isothermal titration calorimetry , hydrogen bond , activity coefficient , thermodynamics , ion , molecule , inorganic chemistry , aqueous solution , organic chemistry , physics , catalysis
In order to address the issue whether both ionic liquids and solvents influence the enthalpy of their solutions, highly accurate excess partial molar enthalpy,HI L E values have been measured using Isothermal Titration Calorimeter (ITC). Therefore, thermodynamic behavior has been observed in the mixtures containing ionic liquids. It essentially depends on the molecular structure of the constituents of the mixture. The hydrogen bonding between ionic liquids and ethyl‐substituted solvents (2‐ethoxyethanol, ethylene glycol, diethylamine, ethyl acetate and N,N ‐ diethylacetamide) may lead to strong ion‐solvent interactions. In the present study, an effort has been made to quantify various interactions between ionic liquid and solvent, based on theHI L E values. Linear solvation free relation shows dependence of limiting excess partial molar enthalpies,HI LE , ∞upon the solvent properties. Structural orientation of solvent molecules and ionic liquids also described by theHI LE , ∞values. The ion‐ion, ion‐solvent interactions have also been investigated in terms of the enthalpic interaction parameters,HI L - I L E and relative apparent molar enthalpy, φ L of ionic liquid‐ethyl‐substituted solvent systems.